Sudoku, today’s most well-known grid-solving puzzle, was originally invented by Howard Garns in 1978. Almost 30 years later, its popularity suddenly exploded. This column presents logic puzzles of various sorts and challenges readers to solve the puzzles in two ways: by hand and with Mathematica. Solvers are invited to send their code to edp@wolfram.com. Fifteen … Continue reading Classic Puzzles in Wolfram Demonstrations